Olive Growing in the Sicilian “Desert”: When Technique Builds Green, Income, and a Future

This is not an experiment to be dismissed.

On the contrary, it is one of those experiences that force a reassessment of many established beliefs about olive cultivation, especially in challenging environments.

We are at the Agri Casalicchio farm, with Antonio and Giuseppe Casalicchio, on soils that are highly clay, low in organic matter, prone to compaction, and affected by clear structural problems. In a context like this, let us be frank: practicing olive growing without a method inevitably leads to failure.

Here, two real field trials have been carried out: one with the Zaragoza vase training system and one with a single-axis hedgerow system. Antonio will ultimately draw his conclusions to decide which direction to pursue.

According to Antonio, the single-axis hedgerow is certainly the most high-performing option, thanks to its practicality in establishment and management. However, the Zaragoza “Vasetto” system planted at a spacing of 6.00 × 3.00 m, approximately 550 trees per hectare also deserves careful consideration within modern olive growing. It represents a technically balanced density that is fully manageable from an operational standpoint.

The “Zaragoza” trees were planted in 2022, when they were still very small. Today, they are in their third year in the field, with a double drip irrigation line on a strongly clayey soil. And this is precisely the key point: in heavy soils, it is not true that olive growing is impossible.

Olive cultivation is feasible, but only if a complete system is built: a stable grass cover, the regular application of organic matter, and proper water management not merely the distribution of volumes.

Irrigation must be managed with skill. In the field, it is clearly evident that trees subjected to slight, controlled water stress are more balanced and, in many cases, more productive.

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The trees are trained with a trunk height of 60–70 cm, a framework consistent with the Zaragoza approach, three formative interventions already completed, and a moderating topping operation to bring all trees to the same height. Only a light internal opening “the palm of the hand” has been carried out, while the light cone has been deliberately postponed.

Today, the tree is in balance.

The true strength of these trees lies not in the pruning shears, but in the number of leaves and their capacity to build photosynthetic surface. Immediately setting three main branches, as in traditional systems, and forcibly “opening” the canopy means consuming resources and creating productive voids.

Old traditional vase systems push olives far from the center of the tree, increase management costs, and require a level of labor that is no longer sustainable today.

Here, instead, the logic is clear: space, productivity, and labor efficiency must coexist.

For those with limited water availability, even wider spacing such as 6 × 6.5 m can be a valid solution, especially when combined with a trunk shaker equipped with an umbrella.

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However, there is one non-negotiable condition: a true grass cover.

Inter-row management is carried out exclusively through mulching, using machines such as BFM units, which operate simultaneously with wire, chain, and disc, and are equipped with support wheels to ensure precise control of working height.

The results are evident: no erosion, accumulation of plant residues, and an increase in organic matter. Where organic matter is present, the soil does not crack.

It is pointless to complain about erosion on hilly land if the soil continues to be tilled. Incorrect cultivation practices promote erosion. In this system, soil cracking disappears. An annual pass with a mole plow along the center of the row further improves drainage and excess water management, increases plant-available moisture, and promotes aeration of the grass cover.

The surrounding landscape is harsh, arid, and barren. In a few months, without rainfall, it will return to being a desert.

Yet within this setting, there is now a continuous green area: it is the entire Casalicchio brothers’ farm.

This is the real result not a “Beautiful” planting, but a system that works.

An oasis built with technique, vision, and coherence, promoted and followed in the field by Agronomist Vito Vitelli as a concrete model of modern olive growing.

Official Editorial Note:
Original content by Agronomist Vito Vitelli, developed and optimized with the support of artificial intelligence tools for educational, informational, and technical enhancement purposes.

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